QT interval

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QT Interval

The QT interval is a measure of the time between the start of the Q wave and the end of the T wave in the heart's electrical cycle. The QT interval represents the time taken for the ventricles to depolarize and repolarize, or in simpler terms, to contract and relax.

Pronunciation

QT Interval: /ˈkjuː tiː ˈɪntərvəl/

Etymology

The term "QT interval" is derived from the letters Q and T on the electrocardiogram (ECG) that represent electrical depolarization and repolarization of the ventricles.

Related Terms

  • Q wave: The first downward deflection observed in the QRS complex in an ECG.
  • T wave: Represents the repolarization of the ventricles in an ECG.
  • Electrocardiogram (ECG): A test that measures the electrical activity of the heart.
  • Ventricles: The two lower chambers of the heart.
  • Depolarization: The process during the action potential when the neuron's charge moves towards a positive charge.
  • Repolarization: The process during the action potential when the neuron's charge moves back towards a negative charge.

See Also

External links

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